Lippmann Hologram Angle-Dependent Information Separation
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Solution Overview
Problem
Existing authentication holograms, particularly those using Lippmann holograms, lack sufficient differentiation between a 3D object and added information, making it difficult to authenticate them effectively.
Innovation Solution
The process involves superposing a hologram mirror pattern and a 3D object hologram master in a volume hologram-recording material, using specific angles and interference fringes to create an authentication hologram that allows the added information to be viewed at a specific angle, providing a clear distinction from the 3D object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a Lippmann hologram with added information is fabricated using a transparent protective sheet, then authentication information is incorporated into the hologram, but the distinction between the 3D object and the added information becomes insufficient, making authentication difficult
Solution Approach 1:
The patent applies local quality by giving different viewing angle characteristics to different parts of the hologram. The added information is designed to be visible only within a specific viewing angle range, while the 3D object image remains visible across a wider angle range. This creates localized differentiation that enables easy authentication without compromising the integration of information.
2Ease of operation
If the added information is made visible across a wide viewing angle, then the information is easily accessible to viewers, but it becomes difficult to distinguish from the 3D object
Solution Approach 1:
The patent implements local quality by creating spatially differentiated visibility characteristics. The added information is confined to a specific angular region, creating a localized zone of high luminance only when viewed from the correct angle. This resolves the contradiction by maintaining ease of access for authorized viewers while providing clear visual distinction through angle-dependent visibility.
3Difficulty of detecting and measuring
If the added information is restricted to a specific viewing angle, then visual distinction from the 3D object is improved, but the information becomes less accessible to general viewers
Solution Approach 1:
The patent applies parameter changes by manipulating the luminance and viewing angle parameters of the added information. By controlling the holographic recording geometry and reconstruction conditions, the added information exhibits high luminance only within a specific angular range. This parameter-based differentiation simultaneously achieves visual distinction and controlled accessibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables easy authentication by ensuring the added information is visible at a specific angle, allowing viewers to distinguish it from the 3D object with high luminance, thus enhancing authentication efficiency.
Implementation Method 1
superposing a hologram mirror pattern and a 3D object hologram master in a volume hologram-recording material, using specific angles and interference fringes to create an authentication hologram
Implementation Method 2
the added information can be viewed only at a specific angle so that a viewer can easily learn which information corresponds to the added information
Data Source
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AI summary
The invention provides an authentication hologram using a Lippmann hologram that enables a 3D object image having a vertical and horizontal field of vision as well as planar, added information viewable at a specific angle alone are viewable, as shown in Fig. 5. In that authentication hologram, a hologram for reconstructing a 3D object image and a hologram mirror pattern that is formed at a pattern portion corresponding to added information and comprising planar interference fringes placed one upon another and parallel at a constant spacing are recorded in a superposing fashion.